I used to work for a power supply company, and my feeling was and still is, that for most customers power supplies are an afterthought.
They spend all the time and R&D dollars on the product itself (not a wrong thing to do, I might add) and then when the remaining budget will not allow anything more complex than a cord, they scramble fanatically to find the cheapest power solution.
A true story: a state of the art optical multiplexer/router. The main board was beyond awesome: a 10'' x 14", 8 layer board, crammed full with all sorts of esoteric and premium components. Gold plating everywhere. The sheer number of components and overall complexity was mind boggling.
It was powered from the cheapest power supply in our catalog, a PSU originally designed for a low cost printer.
The contrasts could not be more stark: the PSU board was a thru-hole, single sided CEM1 job.
Long story short: there were many factory failures. The root cause was that, to save a few pennies, they had specified that the DC output header to be unkeyed, meaning that the operators could by mistake reverse the connector while assembling the unit.
I suggested a keyed connector like the one in the photo, but the customer engineering never gave the approval. Citing backward compatibility issues, etc.